“The library is now closed,” she said. “Mind you return anything you have borrowed to the correct — what have you been doing to that book, you depraved boy?” “It isn’t the library’s, it’s mine!” said Harry hastily, snatching his copy of Advanced Potion-Making off the table as she lunged at it with a clawlike hand. “Despoiled!” she hissed. “Desecrated! Befouled!” “It’s just a book that’s been written on!” said Harry, tugging it out of her grip. She looked as though she might have a seizure; Hermione, who had hastily packed her things, grabbed Harry by the arm and frogmarched him away. “She’ll ban you from the library if you’re not careful. Why did you have to bring that stupid book?”